﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace VirtualDisk
{
    //表示不存在的命令，执行时只打印一行错误信息
    class NoExistCommand:Command
    {

        protected override int run()
        {
            Console.WriteLine("不是有效的命令！");
            return 0;
        }
    }
}
